I'm not trying to sound like a Debbie downer when saying this but here goes. So...we're going to die I assume or some OTHER such terrible unavoidable end? I honestly hope not too many horror games use such inescapable death as the ultimate scare if you will but it's over used, and cliched. In my honest opinion living through such an event can and often is MUCH worse. Want proof ask anyone who's been in wartime combat.
That aside I do hope a happy ending can be achieved in some way maybe in a sequel or something I don't know I just know that the girls are super cute and I'd hate to think they're all psycho killers. From what I've got they don't want to kill it's just they're so strong and horny they break their lovers on accident.
ON to ideas investigation sounds neat Rogue like mode could be good if handled well.